op {
  name: "Enter"
  input_arg {
    name: "data"
    type_attr: "T"
  }
  output_arg {
    name: "output"
    type_attr: "T"
  }
  attr {
    name: "T"
    type: "type"
  }
  attr {
    name: "frame_name"
    type: "string"
  }
  attr {
    name: "is_constant"
    type: "bool"
    default_value {
      b: false
    }
  }
  attr {
    name: "parallel_iterations"
    type: "int"
    default_value {
      i: 10
    }
  }
}
